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TLV320AIC3254使用过程遇到的问题

IIS音频输入,DAC设置如下:

IIC_Write(0x00,0x00);

IIC_Write_2ByteData(0x0b,0x81,0x82);//# NDAC = 1, MDAC = 2

IIC_Write_2ByteData(0x0d,0x00,0x80);//# Program the OSR of DAC to 128

IIC_Write_2ByteData(0x0f,0x03,0x88);//# IDAC = 904

IIC_Write(0x11,0x08);//# 8x Interpolation

IIC_Write(0x3c,0x00);//# Use DAC miniDSP for signal processing

IIC_Write_2ByteData(0x00,0x2c,0x04);//# Select Page 44, Enable Adaptive mode for DAC

按以上设置IIS音频输入,喇叭和耳机都没有输出。如果把其中IIC_Write(0x3C,0x00)改为IIC_Write(0x3C,0x08),喇叭和耳机就可以正常声音输出了。
这是为什么?难道IIS音频输入不能应用于signal processing吗?